Donald Siao, MD
NPI 1861415374ActiveIndividual· Family Medicine· San Jose, CA
Listed on the HHS-OIG exclusion list since November 2024 (1128a4). Family Medicine (MD) in San Jose, California, licensed in CA, with an NPI issued in July 2006. Their prescriptions cost Medicare Part D more than their services did: $192,923 for 1,865 claims, against $6,277 paid for services in 2024. Exact Sciences Corporation was the largest of 4 companies reporting payments in 2025, $98.01 in all, mostly food and beverage.
Overview
| NPI | 1861415374 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jul 25, 2006 |
| Last updated in NPPES | Jul 8, 2007 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Family Medicine Primary | 207Q00000X | G73395 | CA |
Exclusion screening
This NPI appears on the OIG exclusion list. Excluded parties cannot be paid by Medicare, Medicaid or other federal health care programs, directly or through an employer.
| Matched by | Name on OIG list | Exclusion type | Excluded since | Location |
|---|---|---|---|---|
| NPI | Donald Siao · Family Practice | 1128a4 | Nov 20, 2024 | San Jose, CA |
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | Listed (NPI) | See above |
| North Carolina Medicaid · Nov 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Not in the public enrollment file of Oct 1, 2026 |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 191 |
|---|---|
| Services billed | 266 across 11 procedure codes |
| Paid by Medicare | $6,277 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,865 · 4,508 30-day fills |
|---|---|
| Patients | 450 |
| Total drug cost | $192,923 |
| Generic share | 86% of claims |
Industry payments (Open Payments)
- 2025$98.01 · 4 payments from 4 companies
- 2024$675.39 · 26 payments from 12 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Exact Sciences Corporation | $34.15 | 1 |
| Cmp Pharma, Inc. | $25.00 | 1 |
| Amgen Inc. | $19.91 | 1 |
| Bayer Healthcare Pharmaceuticals Inc. | $18.95 | 1 |
What the 2025 payments were for
- Food and Beverage$98.01 · 4 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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